[TR] Overdrive issues

[hdrider570 at att.net]

When I had this problem with a J type OD, it was wear in the pump 
piston/bore.  This pump uses no seals so I expect that your mechanics 
are talking about the accumulator piston(s).  Basically when the 
piston/bore wears the clearances increase which allows oil to bypass the 
piston resulting in lower pressure.  One thing that I noticed was that 
the slippage was more pronounced once the OD warmed up thus reducing the 
viscosity of the oil.

I expect that a worn drive pin in the piston could cause a similar 
problem by shortening the piston sweep.

Bottom line is if you are not getting enough oil pressure, it is a 
hydraulic problem which is either not enough supply (pump wear?) or 
excessive losses somewhere such as bad piston seals etc.

Edward Hamer
Petaluma CA
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